The blood capillaries of intestinal villi cannot absorb

Options

A. Glucose
B. Salts
C. Fatty acids and glycerides
D. Amino acids

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which substance the blood capillaries of intestinal villi cannot absorb. The options provided are glucose, salts, fatty acids and glycerides, and amino acids.

2. **Function of Intestinal Villi**: The intestinal villi are small, finger-like projections in the small intestine that increase the surface area for absorption. They contain blood capillaries that play a crucial role in nutrient absorption.

3. **Nutrient Absorption**: The blood capillaries in the villi are responsible for absorbing several essential nutrients:
- **Glucose**: A simple sugar that is easily absorbed into the bloodstream.
- **Salts**: Various ions that are crucial for bodily functions are also absorbed.
- **Amino Acids**: The building blocks of proteins are absorbed through the capillaries.

4. **Fatty Acids and Glycerides**: Unlike the other nutrients mentioned, fatty acids and glycerides are not absorbed directly into the blood capillaries of the intestinal villi. Instead, they are absorbed into the lymphatic system through specialized structures called lacteals, which are part of the villi.

5. **Conclusion**: Therefore, the correct answer to the question is that the blood capillaries of intestinal villi cannot absorb **fatty acids and glycerides**.

**Final Answer**: The blood capillaries of intestinal villi cannot absorb fatty acids and glycerides.

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